Machine models

Komatsu HD785-5 specifications

Entries in this reference
Listing-entry count
1

Short answer

Komatsu HD785-5: rigid rock truck.

Selected configuration figures
Configuration	Documented field and quantity
HD785-5	Gross Power 1,042 hp Overall Length 34.83 ft

Operational
Specification	HD785-5
Fuel Capacity	330 gal
Cooling System Fluid Capacity	60 gal
Engine Oil Capacity	37 gal

Transmission and speeds
Specification	HD785-5
Transmission Type	Komatsu 7-speed, electronically-controlled, automatic powershift transmission
Number Of Gears - Forward	7
Number Of Gears - Reverse	1
Max Speed	40.2 mph

Weights
Specification	HD785-5
Empty Weight	155,403 lb
Loaded Weight	367,000 lb
Weight Distribution Front - Empty	48 %
Weight Distribution Rear - Empty	52 %
Weight Distribution Front - Loaded	33 %
Weight Distribution Rear - Loaded	67 %

Ratios
Figure	HD785-5
Engine horsepower per 1,000 lb of weight	6.7
Fuel tank per engine horsepower	0.32 gal
Rated payload per cubic yard of heaped body	2,185 lb

Reference directory classification
Equipment group	rigid rock truck

Where the HD785-5 ranks in Komatsu's list — Scope of the captured comparison
Brand	Equipment group	Compared entry	Sort order
Komatsu	rigid rock truck	HD785-5	Descending quantity; 1 is largest

Figure	HD785-5	Rank	Lowest in line	Highest in line
Engine power	1,042.0 hp	4 of 9	230.0 hp	3,346.0 hp
Listed weight	155,403 lb	4 of 12	37,016 lb	549,998 lb
Fuel capacity	330.0 gal	5 of 10	127.9 gal	1,400.0 gal
Horsepower per 1,000 lb	6.7 hp	5 of 9	6.0 hp	8.4 hp
Rated payload	171,961.0 lb	5 (tied) of 10	36,000.0 lb	719,997.0 lb

The HD785-5 beside its neighbours

Related discussion: “Komatsu Hd785 7 Front Wheel Hub”: HD785-1.

Used market for the HD785-5 — Dated first-page listing snapshot
Observation date	Listing source	Equipment search	Listings
2026-09-24	MachineryTrader	Komatsu rigid rock truck	5

Model	Listed	Model years	Lowest asking	Highest asking	Median asking	Median hours
HD785-5	5	1998 to 2005	$199,264	$210,650	$204,957	20,400

HD785-5: recall reference — Dated CPSC search
Search date	Database	Names queried	Search result
2026-09-24	U.S. Consumer Product Safety Commission	Komatsu together with the rigid rock truck HD785-5	No matching recall in this search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Komatsu HD785-5 — RitchieSpecs. Observed 2026-09-24.
Used-market listings	Used-market listings: MachineryTrader listings for Komatsu HD785-5 — MachineryTrader. Observed 2026-09-24.
Federal agency data	Federal agency data: Recall database search for Komatsu — U.S. Consumer Product Safety Commission. Observed 2026-09-24.

HD785-5

Specification	Source figure
Dimensions and weight
Overall Length	34.83 ft
Overall Width	18.58 ft
Overall Height	17.25 ft
Ground Clearance	2.56 ft
Dump Height	33.41 ft
Dump Ground Clearance	2.55 ft
Dump
Rated Payload	171,961 lb
Load Capacity - Heaped	78.7 yd3
Load Capacity - Struck	50.5 yd3
Raise Time	12 sec
Lower Time	13 sec
Engine
Number Of Cylinders	12
Engine Model	SAA12V140ZE-2
Gross Power	1,042 hp
Displacement	1,861 cu in
Operational
Fuel Capacity	330 gal
Cooling System Fluid Capacity	60 gal
Engine Oil Capacity	37 gal
Transmission and speeds
Transmission Type	Komatsu 7-speed, electronically-controlled, automatic powershift transmission
Number Of Gears - Forward	7
Number Of Gears - Reverse	1
Max Speed	40.2 mph
Weights
Empty Weight	155,403 lb
Loaded Weight	367,000 lb
Weight Distribution Front - Empty	48 %
Weight Distribution Rear - Empty	52 %
Weight Distribution Front - Loaded	33 %
Weight Distribution Rear - Loaded	67 %